Resta dos de diez.

Here, resta is the informal command form of the verb restar, which means to subtract.

So Resta dos de diez is telling someone:

• Subtract two from ten

It is not a full sentence with you stated, because Spanish often leaves the subject unstated when it is clear.

Because the usual Spanish pattern is:

• restar X de Y = to subtract X from Y

So:

• resta dos de diez
  • literally: subtract two from ten

This can feel backward to English speakers at first, because English says:

• subtract two from ten

but Spanish builds it as:

• restar dos de diez

The number being taken away comes first (dos), and the starting number comes after de (diez).

Because that would reverse the meaning.

In Spanish, with restar X de Y:

• X = the amount you take away
• Y = the original number

So:

• Resta dos de diez = subtract 2 from 10
• Resta diez de dos would mean subtract 10 from 2

That is the opposite setup.

In this sentence, resta is a verb: the tú command of restar.

But la resta is also a noun, meaning:

• subtraction
• the subtraction problem / result of subtracting

So Spanish has both:

• la resta = the subtraction
• resta = subtract!

Context tells you which one it is. In Resta dos de diez, it is clearly the verb.

Yes, it is a normal and correct way, especially in:

• math instruction
• classroom language
• textbook-style directions

That said, Spanish also commonly uses other ways to express the same idea, such as:

• Diez menos dos = ten minus two
• Réstale dos a diez = subtract two from ten
• Quita dos de diez or quítale dos a diez can appear in more conversational explanations, though restar is more standard for math

So Resta dos de diez is correct and natural, especially in a teaching or exercise context.

Because Spanish usually drops subject pronouns when the verb already shows who the subject is.

In this case:

• resta already tells you it is a command to tú

So Spanish normally says:

• Resta dos de diez

not:

• Tú resta dos de diez

Adding tú is possible, but it is usually unnecessary unless you want emphasis or contrast.

Yes. Resta is the informal singular command used with tú.

Other versions are:

• Reste dos de diez. = formal singular (usted)
• Resten dos de diez. = plural (ustedes), common in Latin America

If you are learning Latin American Spanish, ustedes is the normal plural form to know.

Yes, you can.

• Resta dos de diez
• Réstale dos a diez

Both express the same basic math operation.

The difference is mainly structure:

• restar X de Y = subtract X from Y
• restarle X a Y = subtract X from Y, using an indirect object style

So:

• Resta dos de diez
• Réstale dos a diez

Both are correct. The second one may feel a little more like spoken instruction, while the first is very direct and textbook-like.

No. In a basic arithmetic instruction like this, Spanish normally uses the numbers directly:

• Resta dos de diez
• Suma tres y cinco
• Multiplica cuatro por dos

You do not usually say:

• Resta el dos del diez

unless you are talking about the written numbers themselves in a special context, not just doing the math operation.

A simple Latin American-style pronunciation would be approximately:

• REHS-tah dohs deh dee-EHS

A few helpful points:

• r in resta is a single tapped r
• e is like eh
• dos has a clear o sound, not like English dose
• diez is one syllable for many speakers, or very close to it: dyes / dyez

You do not need to over-pronounce anything; just keep the vowels clear and short.

Yes. Although in this sentence it is mathematical, restar can also mean more generally:

• to subtract
• to reduce
• to take away from

For example:

• Eso no le resta valor al proyecto.
  • That does not diminish the project’s value.

But in Resta dos de diez, the meaning is plainly the math sense: subtract.